Android启动模式

在layout，activity_main.xml中写入代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="cn.edu.bzu.maintest.MainActivity">

<Button
android:id="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第一个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<Button
android:id="@+id/button2"
android:onClick="click2"
android:layout_below="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第二个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<Button
android:id="@+id/button3"
android:onClick="click3"
android:layout_below="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第三个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<TextView
android:layout_below="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="50sp"
android:text="第一个页面" />
</RelativeLayout>

在layout，activity_main2.xml中写入代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main2"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="cn.edu.bzu.maintest.Main2Activity">
<Button
android:id="@+id/button1"
android:onClick="click1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第一个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<Button
android:id="@+id/button2"
android:layout_below="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第二个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<Button
android:id="@+id/button3"
android:onClick="click3"
android:layout_below="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第三个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<TextView
android:layout_below="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="50sp"
android:text="第二个页面" />

</RelativeLayout>

在layout，activity_main3.xml中写入代码：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_main3"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="cn.edu.bzu.maintest.Main3Activity">
<Button
android:id="@+id/button1"
android:onClick="click1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第一个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<Button
android:id="@+id/button2"
android:onClick="click2"
android:layout_below="@+id/button1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第二个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<Button
android:id="@+id/button3"
android:layout_below="@+id/button2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="第三个页面"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="30dp"/>
<TextView
android:layout_below="@+id/button3"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="50sp"
android:text="第三个页面" />

</RelativeLayout>

在mainifests中的AndroidMainifest.xml中代码如下：

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="cn.edu.bzu.maintest">

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Main2Activity" ></activity>
<activity android:name=".Main3Activity"></activity>
</application>

</manifest>

在Java文件下的cn.edu.bzu.maintest中，MainActivity代码如下：

package cn.edu.bzu.maintest;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}

public void click2(View view){
Intent intent=new Intent(this,Main2Activity.class);
startActivity(intent);
Log.i("Tag","页面二taskId:"+getTaskId());
}
public void click3(View view){
Intent intent=new Intent(this,Main3Activity.class);
startActivity(intent);
Log.i("Tag","页面三taskId:"+getTaskId());
}
}

在Java文件下的cn.edu.bzu.maintest中，Main2Activity代码如下：

package cn.edu.bzu.maintest;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class Main2Activity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);

}
public void click1(View view){
Intent intent=new Intent(this,MainActivity.class);
startActivity(intent);
Log.i("Tag","页面一taskId:"+getTaskId());
}
public void click3(View view){
Intent intent=new Intent(this,Main3Activity.class);
startActivity(intent);
Log.i("Tag","页面三taskId:"+getTaskId());
}
}

在Java文件下的cn.edu.bzu.maintest中，Main3Activity代码如下：

package cn.edu.bzu.maintest;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;

public class Main3Activity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main3);
}
public void click1(View view){
Intent intent=new Intent(this,MainActivity.class);
startActivity(intent);
Log.i("Tag","页面一taskId:"+getTaskId());
}

public void click2(View view){
Intent intent=new Intent(this,Main2Activity.class);
startActivity(intent);
Log.i("Tag","页面二taskId:"+getTaskId());
}

}